कार्बन की परमाणु संख्या क्या है, जो मेंडलीफ और आधुनिक आवर्त सारणी दोनों में समान रहती है?

Which classification law of chemical elements was proposed by J.A.R. Newlands in 1865?

Match the group numbers with their corresponding element family names: i. III A (Group 13) ii. IV A (Group 14) iii. VI A (Group 16) iv. VII A (Group 17) a. Chalcogen family b. Halogen family c. Boron family d. Carbon family